HIGH-RESOLUTION MOLECULAR SPECTROSCOPY WITH 2.5 TERAHERTZ QUANTUM CASCADE LASERS

被引:0
作者
Pavlov, Sergey G. [1 ]
Huebers, Heinz-Wilhelm [1 ]
Greiner-Baer, Michael [1 ]
Richter, Heiko [1 ]
Mahler, Lukas [2 ,4 ]
Tredicucci, Alessandro [2 ,4 ]
Beere, Harvey E. [3 ]
Ritchie, David A. [3 ]
机构
[1] German Aerosp Ctr DLR, Inst Planetaty Res, Rutherfordstr 2, D-12489 Berlin, Germany
[2] NEST CNR INFM, I-56126 Pisa, Italy
[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
[4] Scuola Normale Super Pisa, I-56126 Pisa, Italy
来源
PROCEEDINGS OF TERA 2008 INTERNATIONAL WORKSHOP THZ RADIATION: BASIC RESEARCH AND APPLICATIONS | 2008年
关键词
terahertz cascade lasers; molecular spectroscopy;
D O I
10.1109/TERA.2008.4673828
中图分类号
TN [电子技术、通信技术];
学科分类号
0809 ;
摘要
Quantum cascade lasers operating at about 2.5 terahertz have been implemented in a spectrometer for high resolution molecular spectroscopy. Linewidth, frequency tunability and frequency stability of the lasers were investigated by mixing their radiation with radiation from a 2.5 terahertz gas laser. Two first laser characteristics were found to be sufficient for Doppler-limited spectroscopy. For a demonstration of the spectrometer, absorption at rotational transitions of methanol was measured. The cascade lasers served as radiation source. A gas laser was used to determine the absolute frequency simultaneously with the detection of absorption signal by mixing the gas laser radiation with a part of that from cascade lasers. Amplitude as well as frequency modulation of the output power of the cascade lasers was used. The pressure broadening and the pressure shift of a rotational transition of methanol at 2.519 terahertz were determined.
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页码:21 / +
页数:2
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